arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1110.0076hep-ex
收藏

CDF强子τ ~+喷注衰变通道顶反顶截面和顶夸克质量的测量

Measurements of the Top Anti-Top Cross Section and the Top Quark Mass in the Hadronic tau + Jets Decay Channel at CDF

Daryl Hare, Eva Hakiadakis

摘要:

我们首次对强子τ +喷注衰变通道的ttbar进行了独家观测。利用这些事件从1.96 TeV的ppbar碰撞在CDF,我们测量的ttbar截面以及顶夸克质量。事件需要一个强子τ,大的横向能量缺失,以及正好4个喷流,其中至少有一个必须被标记为b喷流。截面测量值是根据给定ttbar截面的观测事件数和预测信号和背景事件数从泊松似然函数中提取的。质量是从似然拟合中提取的,该似然拟合基于从前导阶信号(ttbar)和背景(W+jets)矩阵元素计算的每事件概率。

英文摘要:

We present the first exclusive observation of the ttbar to hadronic tau + jets decay channel. Using these events from 1.96 TeV ppbar collisions at CDF, we measure the ttbar cross section as well as the top quark mass. Events require a single hadronic tau, large missing transverse energy, and exactly 4 jets of which at least one must be tagged as a b jet. The cross section measurement is extracted from a Poisson likelihood function based on the observed number of events and the predicted number of signal and background events for a given ttbar cross section. The mass is extracted from a likelihood fit based on per-event probabilities calculated from leading-order signal (ttbar) and background (W+jets) matrix elements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑